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https://issues.apache.org/jira/browse/CALCITE-5253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Evgeny Stanilovsky updated CALCITE-5253:
----------------------------------------
    Description: 
Such issue is not possible for now: 
{code:java}
CREATE TABLE t1(a INTEGER, b INTEGER, c INTEGER);
CREATE TABLE t2(b INTEGER, c INTEGER, d INTEGER);
CREATE TABLE t3(c INTEGER, d INTEGER, e INTEGER);

SELECT t1.c, t2.d, t1.b, t1.a, t3.e FROM t1 natural join t2 natural join t3 
WHERE t1.a=1;
{code}

cause:


{noformat}
SqlValidatorException: Column name 'C' in NATURAL join or USING clause is not 
unique on one side of join
{noformat}


Was broken by:
[1] https://issues.apache.org/jira/browse/CALCITE-5171


  was:
Such issue is not possible for now: 
{code:java}
CREATE TABLE t1(a INTEGER, b INTEGER, c INTEGER);
CREATE TABLE t2(b INTEGER, c INTEGER, d INTEGER);
CREATE TABLE t3(c INTEGER, d INTEGER, e INTEGER);

SELECT t1.c, t2.d, t1.b, t1.a, t3.e FROM t1 natural join t2 natural join t3 
WHERE t1.a=1;
{code}

cause:


{noformat}
SqlValidatorException: Column name 'C' in NATURAL join or USING clause is not 
unique on one side of join
{noformat}


Was broken by:
[1] https://issues.apache.org/jira/browse/CALCITE-5171

So this is a regression.


> Natural join fields validation partially broken after CALCITE-5171
> ------------------------------------------------------------------
>
>                 Key: CALCITE-5253
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5253
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.31.0
>            Reporter: Evgeny Stanilovsky
>            Assignee: Evgeny Stanilovsky
>            Priority: Major
>              Labels: pull-request-available
>
> Such issue is not possible for now: 
> {code:java}
> CREATE TABLE t1(a INTEGER, b INTEGER, c INTEGER);
> CREATE TABLE t2(b INTEGER, c INTEGER, d INTEGER);
> CREATE TABLE t3(c INTEGER, d INTEGER, e INTEGER);
> SELECT t1.c, t2.d, t1.b, t1.a, t3.e FROM t1 natural join t2 natural join t3 
> WHERE t1.a=1;
> {code}
> cause:
> {noformat}
> SqlValidatorException: Column name 'C' in NATURAL join or USING clause is not 
> unique on one side of join
> {noformat}
> Was broken by:
> [1] https://issues.apache.org/jira/browse/CALCITE-5171



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